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Communications system and method, information processing apparatus and method, and program

a technology of information processing apparatus and method, applied in the field of communication system and method, to achieve the effect of performing highly precise clock synchronization with eas

Inactive Publication Date: 2006-05-25
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] The present invention is made in view of such circumstances, and is one that makes it possible to perform highly precise clock synchronization with ease.

Problems solved by technology

For this reason, between devices connected to a network, it was difficult to perform highly precise clock synchronization by using network frames.
Therefore, there has been a problem in that in order to implement the communications system described above, it should start with hardware design, and implementation has not been easy.
Further, there has been a problem in that the cost of the dedicated hardware installed in the communications system described above has been incurred.

Method used

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  • Communications system and method, information processing apparatus and method, and program
  • Communications system and method, information processing apparatus and method, and program
  • Communications system and method, information processing apparatus and method, and program

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Embodiment Construction

[0043] Hereinafter, embodiments of the present invention are described with reference to the drawings.

[0044]FIG. 1 shows a configuration example of an AV (Audio Visual) data communications system 1 to which the present invention is applied. To a network 11, representative of which is a LAN (Local Area Network), are interconnected a synchronization master apparatus 12, and synchronization slave apparatuses 13-1 to 13-3 (hereinafter, in cases where it is unnecessary to individually differentiate between these synchronization slave apparatuses, they will be referred to simply as synchronization slave apparatus (es) 13) via a hub 14.

[0045] The network 11 may be configured with, for example, 100 Base-T Ethernet (trademark). In this network 11, the CSMA / CD (Carrier Sense Multiple Access with Collision Detection) scheme is adopted, and transmission / reception of data between the synchronization master apparatus 12 and the synchronization slave apparatuses 13 is performed via the 100 Base-...

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Abstract

The present invention relates to a communications system and method, an information processing apparatus and method, as well as a program, which make it possible to perform highly precise clock synchronization with ease. A synchronization master apparatus 12 generates a synchronization control frame at t1, waits for duration A1, starts transmission of the synchronization control frame at t2 at which point the value of the clock counter register becomes “0,” and resets the clock counter register at t3 at which point transmission of the synchronization control frame is completed. On the other hand, a synchronization slave apparatus 13 starts reception of the synchronization control frame at the same timing as t2, completes reception of the synchronization control frame at the same timing as t3, and resets the clock counter register. The present invention may be applied to an AV data communications system that transmits and receives real time data such as video data, audio data and the like.

Description

TECHNICAL FIELD [0001] The present invention relates to a communications system and method, to an information processing apparatus and method, and to a program, and relates, in particular, to a communications system and method, an information processing apparatus and method, and a program in which it is made possible to perform highly precise clock synchronization. BACKGROUND ART [0002] Conventionally, in CSMA / CD (Carrier Sense Multiple Access with Collision Detection) or CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) scheme networks, such as EtherNet (trademark) and IEEE 802.11 wireless LAN (Local Area Network), in principle, the timing at which network frames are transmitted is not guaranteed to start precisely in a timing of given intervals or in a particular timing. This is due to the effects of the carrier sense time for determining the transmission timing and the random back off time accompanying collision. [0003] For this reason, between devices connected to...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F15/16G06F1/04H04J3/06H04L12/28H04L7/08
CPCH04J3/0658H04L7/08H04J3/06G06F1/04H04L12/28
Inventor OOI, TAKUYA
Owner SONY CORP
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